818470981 has 2 divisors, whose sum is σ = 818470982. Its totient is φ = 818470980.

The previous prime is 818470979. The next prime is 818470993. The reversal of 818470981 is 189074818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 605602881 + 212868100 = 24609^2 + 14590^2 .

It is a cyclic number.

It is not a de Polignac number, because 818470981 - 2¹ = 818470979 is a prime.

It is a super-2 number, since 2×818470981² = 1339789493478204722, which contains 22 as substring.

Together with 818470979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818470181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409235490 + 409235491.

It is an arithmetic number, because the mean of its divisors is an integer number (409235491).

Almost surely, 2^818470981 is an apocalyptic number.

It is an amenable number.

818470981 is a deficient number, since it is larger than the sum of its proper divisors (1).

818470981 is an equidigital number, since it uses as much as digits as its factorization.

818470981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 818470981 is about 28608.9318395497. The cubic root of 818470981 is about 935.4080333721.

The spelling of 818470981 in words is "eight hundred eighteen million, four hundred seventy thousand, nine hundred eighty-one".